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cf13f0ea HC |
1 | /* |
2 | * arch/s390/kernel/relocate_kernel64.S | |
3 | * | |
4 | * (C) Copyright IBM Corp. 2005 | |
5 | * | |
6 | * Author(s): Rolf Adelsberger <adelsberger@de.ibm.com> | |
5d3f229f | 7 | * Heiko Carstens <heiko.carstens@de.ibm.com> |
cf13f0ea HC |
8 | * |
9 | */ | |
10 | ||
11 | /* | |
12 | * moves the new kernel to its destination... | |
13 | * %r2 = pointer to first kimage_entry_t | |
14 | * %r3 = start address - where to jump to after the job is done... | |
15 | * | |
16 | * %r5 will be used as temp. storage | |
17 | * %r6 holds the destination address | |
18 | * %r7 = PAGE_SIZE | |
19 | * %r8 holds the source address | |
20 | * %r9 = PAGE_SIZE | |
21 | * | |
22 | * 0xf000 is a page_mask | |
23 | */ | |
24 | ||
25 | .text | |
26 | .globl relocate_kernel | |
27 | relocate_kernel: | |
28 | basr %r13,0 #base address | |
29 | .base: | |
5d3f229f | 30 | stnsm sys_msk-.base(%r13),0xf8 #disable DAT and IRQs |
cf13f0ea | 31 | spx zero64-.base(%r13) #absolute addressing mode |
5d3f229f HC |
32 | stctg %c0,%c15,ctlregs-.base(%r13) |
33 | stmg %r0,%r15,gprregs-.base(%r13) | |
34 | lghi %r0,3 | |
35 | sllg %r0,%r0,31 | |
36 | stg %r0,0x1d0(%r0) | |
37 | la %r0,.back_pgm-.base(%r13) | |
38 | stg %r0,0x1d8(%r0) | |
39 | la %r1,load_psw-.base(%r13) | |
40 | mvc 0(8,%r0),0(%r1) | |
41 | la %r0,.back-.base(%r13) | |
42 | st %r0,4(%r0) | |
43 | oi 4(%r0),0x80 | |
44 | lghi %r0,0 | |
45 | diag %r0,%r0,0x308 | |
46 | .back: | |
47 | lhi %r1,1 #mode 1 = esame | |
48 | sigp %r1,%r0,0x12 #switch to esame mode | |
49 | sam64 #switch to 64 bit addressing mode | |
50 | basr %r13,0 | |
51 | .back_base: | |
52 | oi have_diag308-.back_base(%r13),0x01 | |
53 | lctlg %c0,%c15,ctlregs-.back_base(%r13) | |
54 | lmg %r0,%r15,gprregs-.back_base(%r13) | |
55 | j .top | |
56 | .back_pgm: | |
57 | lmg %r0,%r15,gprregs-.base(%r13) | |
cf13f0ea HC |
58 | .top: |
59 | lghi %r7,4096 #load PAGE_SIZE in r7 | |
60 | lghi %r9,4096 #load PAGE_SIZE in r9 | |
61 | lg %r5,0(%r2) #read another word for indirection page | |
62 | aghi %r2,8 #increment pointer | |
63 | tml %r5,0x1 #is it a destination page? | |
64 | je .indir_check #NO, goto "indir_check" | |
65 | lgr %r6,%r5 #r6 = r5 | |
66 | nill %r6,0xf000 #mask it out and... | |
67 | j .top #...next iteration | |
68 | .indir_check: | |
69 | tml %r5,0x2 #is it a indirection page? | |
70 | je .done_test #NO, goto "done_test" | |
71 | nill %r5,0xf000 #YES, mask out, | |
72 | lgr %r2,%r5 #move it into the right register, | |
73 | j .top #and read next... | |
74 | .done_test: | |
75 | tml %r5,0x4 #is it the done indicator? | |
76 | je .source_test #NO! Well, then it should be the source indicator... | |
77 | j .done #ok, lets finish it here... | |
78 | .source_test: | |
79 | tml %r5,0x8 #it should be a source indicator... | |
80 | je .top #NO, ignore it... | |
81 | lgr %r8,%r5 #r8 = r5 | |
82 | nill %r8,0xf000 #masking | |
83 | 0: mvcle %r6,%r8,0x0 #copy PAGE_SIZE bytes from r8 to r6 - pad with 0 | |
84 | jo 0b | |
85 | j .top | |
86 | .done: | |
87 | sgr %r0,%r0 #clear register r0 | |
88 | la %r4,load_psw-.base(%r13) #load psw-address into the register | |
89 | o %r3,4(%r4) #or load address into psw | |
90 | st %r3,4(%r4) | |
91 | mvc 0(8,%r0),0(%r4) #copy psw to absolute address 0 | |
5d3f229f HC |
92 | tm have_diag308-.base(%r13),0x01 |
93 | jno .no_diag308 | |
94 | diag %r0,%r0,0x308 | |
95 | .no_diag308: | |
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96 | sam31 #31 bit mode |
97 | sr %r1,%r1 #erase register r1 | |
98 | sr %r2,%r2 #erase register r2 | |
99 | sigp %r1,%r2,0x12 #set cpuid to zero | |
100 | lpsw 0 #hopefully start new kernel... | |
101 | ||
102 | .align 8 | |
103 | zero64: | |
104 | .quad 0 | |
105 | load_psw: | |
106 | .long 0x00080000,0x80000000 | |
107 | sys_msk: | |
108 | .quad 0 | |
5d3f229f HC |
109 | ctlregs: |
110 | .rept 16 | |
111 | .quad 0 | |
112 | .endr | |
113 | gprregs: | |
114 | .rept 16 | |
115 | .quad 0 | |
116 | .endr | |
117 | have_diag308: | |
118 | .byte 0 | |
119 | .align 8 | |
cf13f0ea HC |
120 | relocate_kernel_end: |
121 | .globl relocate_kernel_len | |
122 | relocate_kernel_len: | |
123 | .quad relocate_kernel_end - relocate_kernel |